Today I was helping an FTC team with its programming. The programming went perfectly fine, but getting the robot to act on it was more difficult than expected. The joysticks were connected to the driver station and through that to the robot controller, but no motors moved. I was super baffled, because I was told that a very similar program had worked before, and I saw the states of the joystick controls on the robot controller's screen.
After much Googling, I found something that suggested rebooting everything and connecting the robot controller's USB cable last. That worked! Both the original program and the new one were able to operate the motors.
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